Card Range To Study

10 Cards in this Set

a. Fibrous membrane extending from the orbital margin to the tarsus;
it is continuous with the pericranium

CLINICAL NOTE

ORBITAL SEPTUM
-two potential terminal areas?

b. Clinical note: the orbital septum acts as a "fire wall" by preventing
the spread of fluid or infectious material from the superficial fascia
of the eyelid to the interior of the orbit and perhaps into the cranial
cavity

a. Located just inside the superolateral orbital margin and indented medially by the tendon of levator palpebrae superioris; the part of the
lacrimal gland superior to the tendon of levator palpebrae superioris
lies in the fossa for the lacrimal gland on the roof of the bony orbit,
and the part of the lacrimal gland inferior to the tendon of levator
palpebrae superioris lies in association with the conjunctival fornix
of the upper eyelid

LACRIMAL GLAND

-where do several ducts extend from? open into?

-where does blinking move lacrimal fluid?

1. Lacrimal gland

b. Several ducts extend from the inferior part of the gland and open
into the lateral part of the conjunctival fornix; from here. blinking
moves lacrimal fluid toward the medial angle of the eye for drainage

3. Lacrimal papilla: tiny projection along the free margin of each eyelid at
the medial angle; at its apex is a tiny opening, the lacrimal punctum,
which drains lacrimal fluid from the lacus lacrimalis into a lacrimal
canaliculus

5. Lacrimal sac: membranous reservoir within the fossa for the lacrimal sac,
just inside the medial orbital margin; it is continuous inferiorly with the
nasolacrimal duct which transports lacrimal fluid to the nasal cavity
(thus, excessive lacrimation is accompanied by a "runny' nose)

BONY ORBIT

BASE or ORBITAL MARGIN
-frontal bone
-zygomatic bone
-maxilla

II. Bony Orbit

A. Shaped like a four-sided pyramid

1. Base or orbital margin: anterior perimeter formed by the frontal bone superiorly, the zygomatic bone laterally and inferolaterally, and the maxilla medially and inferomedially